Compare 2 SQL Tables for change in data

I have 2 SQL tables, one is the current months data (TABLE A) , and one is the previous months data (TABLE B).

When the new data is imported, the data is moved  from (A) to (B) then the new data is imported into (A). Thus giving us a rolling 2 months data.

Each table contains 3 columns, of { CODE, DESC, PRICE}

I would like to run a report that shows ONLY the data that has changed in the last month, whether is be DESC or PRICE or BOTH... code never changes....